Answer to Question #328157 in Statistics and Probability for Payal

Question #328157

 The intelligence quotients (IQs) of 16 students from one area of a city showed a mean of 107 and a standard deviation of 10, while the IQs of 14 students from another area of the city showed a mean of 112 and a standard deviation of 8. What would be the ‘ t ’ value to test whether there is a significant difference between the IQs of the two groups at significance level 0.01?


a. 2.56


b. 1.45


c. 3.45


d. 2.22


1
Expert's answer
2022-04-14T03:29:08-0400

n1=16n2=14xˉ1=107xˉ2=112s1=10s2=8ν=(s12n1+s22n2)21n11(s12n1)2+1n21(s22n2)2=(10216+8214)2115(10216)2+113(8214)2=27.804328T=xˉ1xˉ2s12n1+s22n2=10711210216+8214=1.51994t1+γ2,ν=t0.995,28=2.76None  is  correctn_1=16\\n_2=14\\\bar{x}_1=107\\\bar{x}_2=112\\s_1=10\\s_2=8\\\nu =\frac{\left( \frac{{s_1}^2}{n_1}+\frac{{s_2}^2}{n_2} \right) ^2}{\frac{1}{n_1-1}\left( \frac{{s_1}^2}{n_1} \right) ^2+\frac{1}{n_2-1}\left( \frac{{s_2}^2}{n_2} \right) ^2}=\frac{\left( \frac{10^2}{16}+\frac{8^2}{14} \right) ^2}{\frac{1}{15}\left( \frac{10^2}{16} \right) ^2+\frac{1}{13}\left( \frac{8^2}{14} \right) ^2}=27.8043\approx 28\\T=\left| \frac{\bar{x}_1-\bar{x}_2}{\sqrt{\frac{{s_1}^2}{n_1}+\frac{{s_2}^2}{n_2}}} \right|=\left| \frac{107-112}{\sqrt{\frac{10^2}{16}+\frac{8^2}{14}}} \right|=1.51994\\t_{\frac{1+\gamma}{2},\nu}=t_{0.995,28}=2.76\\None\,\,is\,\,correct


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